Insight Into disorder, stress and strain of radiation damaged pyrochlores: a possible mechanism for the appearance of defect fluorite

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dc.contributor.authorFinkeldei, SCen_AU
dc.contributor.authorChang, Sen_AU
dc.contributor.authorIonescu, Men_AU
dc.contributor.authorOldfield, DTen_AU
dc.contributor.authorDavis, Jen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorSimeone, Den_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorBrandt, Fen_AU
dc.contributor.authorBosbach, Den_AU
dc.contributor.authorKlinkenberg, Men_AU
dc.contributor.authorThorogood, GJen_AU
dc.date.accessioned2022-03-31T23:36:31Zen_AU
dc.date.available2022-03-31T23:36:31Zen_AU
dc.date.issued2021-11-08en_AU
dc.date.statistics2022-03-24en_AU
dc.description.abstractWe have examined the irradiation response of a titanate and zirconate pyrochlore—both of which are well studied in the literature individually—in an attempt to define the appearance of defect fluorite in zirconate pyrochlores. To our knowledge this study is unique in that it attempts to discover the mechanism of formation by a comparison of the different systems exposed to the same conditions and then examined via a range of techniques that cover a wide length scale. The conditions of approximately 1 displacement per atom via He2+ ions were used to simulate long term waste storage conditions as outlined by previous results from Ewing in a large enough sample volume to allow for neutron diffraction, as not attempted previously. The titanate sample, used as a baseline comparison since it readily becomes amorphous under these conditions behaved as expected. In contrast, the zirconate sample accumulates tensile stress in the absence of detectable strain. We propose this is analogous to the lanthanide zirconate pyrochlores examined by Simeone et al. where they reported the appearance of defect fluorite diffraction patterns due to a reduction in grain size. Radiation damage and stress results in the grains breaking into even smaller crystallites, thus creating even smaller coherent diffraction domains. An (ErNd)2(ZrTi)2O7 pyrochlore was synthesized to examine which mechanism might dominate, amorphization or stress/strain build up. Although strain was detected in the pristine sample via Synchrotron X-ray diffraction it was not of sufficient quality to perform a full analysis on. Copyright © 2021 Finkeldei, Chang, Ionescu, Oldfield, Davis, Lumpkin, Simeone, Avdeev, Brandt, Bosbach, Klinkenberg and Thorogood.en_AU
dc.description.sponsorshipThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).en_AU
dc.identifier.articlenumber706736en_AU
dc.identifier.citationFinkeldei, S. C., Chang, S., Ionescu, M., Oldfield, D., Davis, J., Lumpkin, G. R., Simeone, D., Avdeev, M., Brandt, F., Bosbach, D., Klinkenberg, M. & Thorogood, G. J. (2021). Insight Into disorder, stress and strain of radiation damaged pyrochlores: a possible mechanism for the appearance of defect fluorite. Frontiers in Chemistry, 9, 706736. doi:10.3389/fchem.2021.706736en_AU
dc.identifier.issn2296-2646en_AU
dc.identifier.journaltitleFrontiers in Chemistryen_AU
dc.identifier.urihttps://doi.org/10.3389/fchem.2021.706736en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12932en_AU
dc.identifier.volume9en_AU
dc.language.isoenen_AU
dc.publisherFrontiers Media S.A.en_AU
dc.subjectPyrochloreen_AU
dc.subjectStressesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectTransmission electron microscopyen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectPhysical radiation effectsen_AU
dc.subjectOrder-disorder transformationsen_AU
dc.subjectFluoriteen_AU
dc.titleInsight Into disorder, stress and strain of radiation damaged pyrochlores: a possible mechanism for the appearance of defect fluoriteen_AU
dc.typeJournal Articleen_AU
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